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Deye vs Sunsynk with 280amph 51.2V DIY batteries


lavaland

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On 2023/01/04 at 5:20 PM, lavaland said:

I imported a bunch of cells from China (Know someobody that knows how to do this right and build them)

280amph 51.2V

Will the Deye vs Sunsynk work with these batteries?

Does anybody have any experience?

Seplos BMS

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It also depends what you want to draw and charge at some bms have limitations, with the JBD I'm currently using its quite strong I've put it to around 200amp discharge and 100amp charge, I know the say Seplos can communicate, but if you set the voltage right you don't really need communication that just my point of view.

 

 

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9 minutes ago, Raj35 said:

It also depends what you want to draw and charge at some bms have limitations, with the JBD I'm currently using its quite strong I've put it to around 200amp discharge and 100amp charge, I know the say Seplos can communicate, but if you set the voltage right you don't really need communication that just my point of view.

 

 

Can you set absorption time on your inverter using voltage? 

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1 hour ago, Chris_S said:

Is your float voltage not set too high? Lithium cells normally float around 3.35V

@Chris_S  they dont really float as to AGM  so they range is 3.2  to 3.65V per cell. 2.5V end voltage, so if you have a 16s end voltage would be 40v and 58.4 max charge voltage as per spec sheet.

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12 minutes ago, Raj35 said:

@Chris_S  they dont really float as to AGM  so they range is 3.2  to 3.65V per cell. 2.5V end voltage, so if you have a 16s end voltage would be 40v and 58.4 max charge voltage as per spec sheet.

If you charging to 3.45V for example after absorption at that voltage they should be allowed to drop naturally to 3.3V it does not affect your SOC. There's a good video on off grid garage about absorption and float. 

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8 minutes ago, Chris_S said:

If you charging to 3.45V for example after absorption at that voltage they should be allowed to drop naturally to 3.3V it does not affect your SOC. There's a good video on off grid garage about absorption and float. 

 

 

So because I don't charge them up to 58.4v I  set them like that, thanks Andies has some nice videos out there and alot to be learned. In fact I followed his advice on the  bus bar.

20211206_083846.jpg

Edited by Raj35
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